montant



2 Sheets-Sheet 1.

A. MONTANT.

(ModeL) DOOR LOOK.

Patented May 1,1883.

No 276,858. FD

YNVEN'T'OH WITNESSES:

'(ModeL) 2 SheetsSheet 2.

'A.M ONTANT.V

DOOR LOCK.

Patented May 1, 1883;

WITNESSES I INVEN TOR. I

(@MQM/ f UNITED STATES PATENT ()FFICE.

ALPHONSE MONTANT, OF NEW YORK, N. Y.

oooa-rocK.

SPECIFICATION forming part of Letters Patent No. 276,858, dated May 1,

Application filed October 21, 1881. (Model) To all whom it may concern I Be it known that I, ALPHONSE MONTANT, of the city,'county, and State of New York, have invented certain new and useful Improvements in Locks, of which the following is a specification.

My invention relates to improvements in looks; and it consists in the formation of the bolt in two parts, one part being controlled and operated by means of a knob or knobs (on the outside of the case) which operate a shaft passing through the lock. The front portion of the bolt is held inposition by suitable guides, and is provided with a spring having a tendency to thrust it constantly outward or into a locked position, and it is withdrawn, when desired,

by means of a short lever affixed to the knob or handle shaft, the end of which lever works between guides formed on or affixed to the front half of the bolt. The second orrear half of the bolt is controlled in position by means of tumbler-levers actuated by a key, each tumbler being operated by a separate bit formed'on the key. The second or rear half of the bolt, when the forward portion is acting simply as a latch, is idle; but immediately it is thrust forward by means of the key it comes behind the rear end of the forward portion of the bolt. The tumblers then fallbehind the housing, and by this means both the forward or latch portion and the rear or looking portion are held securely in position, so that neither can be operated by the handle until such time as the tumbler-levers release the housing by the insertion and turning of the key. The tumbler-levers are pivoted to a standard fixed to the main plate of the case, and at their forward ends are provided with slots for the passage of the upper portion of the housing. They are also provided with' the ordinary races or courses for the bits of the key. In addition to the tumbler-levers already described, I provide each side of themain series of tumblers with a key-detaining lever formed with a lug extending laterally, of such shape-that it shall serve as a stop to prevent the key from being turned too far round in the lock. The detaining-levers are operated by exbolt for the purpose of throwing the sameinto a locked position. A lug extends from the side of one of the holding-levers, in position to be operated by the extended bits, for the purpose of disengaging the detaining-levers. When the forward portion ofthe bolt is free from the rear orlockin g portion itacts as an ordinary latch. Therear portion is shot into a locked position by means of the key, and is thrown back (when the tumblers so allow) by .means of the forward or latch portion being thrust against its forward end by means of the knobs or handles.

The accompanying drawings, which form part of this specification, represent what I consider the best means of carrying out my invention.

Figure 1 represents an internal front view, and Fig. 2 a plan, of my improved lock, showin g the parts in the position they assume when the forward portion of the bolt is acting as a latch with the boltin a latched position. Fig. 3 is a similar view to Fig. 1, with the exception that the forward bolt is shown in an unlatched position. Fig. 4 is a similar view with all the parts in a locked position. Figs. 5, 6, 7, and 8 represent detail views of a pair of the main tumblers. Figs. 9 and 10 show similar views of one of the latch-tumblers. Fig. 11 is a side View of the key.

In each of the views similar letters of reference indicate like parts wherever they occur.

A represents a portion of the main case of the lock; 13, the forward or latch portion, and O the rear or looking portion; of the bolt.

D represents one of a pair of knobs or handies affixed to and operating a shaft, d, passing through the lock. The front portion, B, of the bolt is held in position by guides at a, affixed to the case A, and it is provided with a spring, B, having a tendency always to thrust it into the latched position, as shown by Figs. 1 and 2, and it is withdrawn, when desired, on turning the knobs D, by means of the short lever d, affixed to the shaft (1. The end of the lever d works between guides b b, formed on or affixed to the latch'B.'

The partOof the bolt is controlled in position by means of a series of tumbler-levers, E, actuated by means of a key, F, (shown in Fig. 11,) each tumbler E being operated by a separate 2 erases bit, f, formed on the key F. The part 0 of the bolt when the part B is acting simply as a latch, as shown in Figs. 1 and 2, is idle; but immediately it is thrust forward by means of the key F into the position shown by Fig. 4 it comes behind the rear end of thelatch B; The

These tumblers E, at their forward ends, are

provided with slots E for the passage of the upper portion, 0, of the housing 0 into the said slots, when the tumblers E are raised into such position by the key F that their slots E shall be in line, as shown in Figs. 1 and 3. The tumblers E are provided with the ordinary races, 6, for the bits f of the key F to operate upon, as is well understood by all acquainted with the manufacture of locks.

G G are additional tumblers or detaininglevers, one arranged on each side of the series of tumblers E. Each of these tumblers G is provided with abearing'piece, g, and also with a lug, g, the rear end, of which serves to prevent the key from turning too far, so as to lower the tumblers so that thelevers E should not be in line with the part c of the housing 0 when the key is inserted and turned with a view to allowing the free motion of the parts B O of the bolt, the key F being simply used to throw the part0 when looking and to release the part0 byraising the tumblers into position for unlocking, the unlocking being effected by means of the knobs D and their connections. The detaining-levers G G are operated by the extended bitsf of the key F. One of each of equal length and breadth is formed on either side of the main bitsf. The extended bitsf also operate on standards 0 standing up on each side of the part 0 of the bolt. The forward ends of the bearing-pieces g of the detaining-levers G are formed with inclined surfaces g adapted to allow of the raising of the detaining-leversGby means of the part cofthe housing 0 when the tumblers are released by the turning of the key F, and the parts are thrown back by the turning of the handles D. A lug, g, extends from each of the additional tumblers G, in position to be operated by the extended bits f of the key F, when it it is desired to elevate the holding-levers to disengage the key.

When the forward portion, B, of the bolt is free from the rear or lockin g portion, 0, it acts as an ordinary latch; but immediately the part 0 is shot forward it is locked.

The lock, as shown and described, is adapted to be operated on either side of the door or other device to which it is applied, both by the knobs or handles D and the key. It can, however, be readily arranged to be operated from one side only, both by the handles D and the key F; or it can be operated on one side by the key F and the handle D on the outside dispensed with. In this case the end of the shaft d must be formed with a socket for the reception of a turning-key. The modus operandi would then be as follows: The key, being introduced, is turned so that the bits are in an upright position, and, striking against the lug, are prevented from further progress. The regular tumblers are thus elevated so that the cuts are in a line with the housing; but the retaining-tumblers, of which the sides {1 rest on top of the housing, are not moved until the knob D, being turned, forces back the latch B, which forces back the part 0, the housing 0 going" through the cuts of the tumblers; The retaining tumblers are then elevated by the housing to the position shown in Figs. 1 and 3. The part 0 is now stationary and the latch part B can be worked at will. The key can remain in or be taken out without in any way disturbing the parts. If, now, it.is desired to close the lock, the lugs on the tumblers G being out of the line of travel of the bits j" of the key, said key can be turned so that the flanges, acting upon the standards 0 force the part 0 against the latch part B, the regular tumblers falling behind the housing, and therefore locking, and the key being now turned back, the bits f act upon the under part of the lugs g of the retaining-tumblers, which are now lowered and elevate said tumblers until the key is turned back, when they again fall to position shown in Figs. and3.

I claim as my invention- 1. In a lock, the combination, with a bolt formed in two parts, as described, of a series of slotted tumblers and a key or operating means adapted to raise said tumblers to the proper height, and a housing formed on or afiixed to the rear portion of the bolt, substantially as and for the purpose described.

2. In a lock having a divided bolt, one portion serving as a latch and the second as a locking or detaining means, the combination of a key or operating means and a standard secured to the rear portion of the bolt and adapted to throw it into a locked position, substantially as shown and described.

3. The combination, in a lock having a divided bolt, B G, of the tumblers E and housing 0, with the additional tumblers G, constructed and adapted to operate substantially as described.

In witness whereof I have hereunto set my hand this 11th day of October, 1881.

ALPHONSE MONTANT.

Witnesses:

W. L. BENNEM, STEPHEN A. POWELL.

IIS 

